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ASTM A204 Grade A Molybdenum Steel

ASTM A204 grade A is a type of ASTM A204 steel. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has the lowest strength and highest ductility compared to the other variants of ASTM A204 steel.

The graph bars on the material properties cards below compare ASTM A204 grade A to: wrought alloy steels in the same category (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness

160

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

22 %

Fatigue Strength

200 MPa 29 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

330 MPa 47 x 103 psi

Tensile Strength: Ultimate (UTS)

520 MPa 75 x 103 psi

Tensile Strength: Yield (Proof)

290 MPa 41 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

410 °C 760 °F

Melting Completion (Liquidus)

1470 °C 2670 °F

Melting Onset (Solidus)

1430 °C 2600 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

52 W/m-K 30 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.2 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.4 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.5 kg CO2/kg material

Embodied Energy

20 MJ/kg 8.6 x 103 BTU/lb

Embodied Water

47 L/kg 5.6 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

95 MJ/m3

Resilience: Unit (Modulus of Resilience)

220 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

18 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

14 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Iron (Fe)Fe 97.6 to 99.46
Molybdenum (Mo)Mo 0.41 to 0.64
Manganese (Mn)Mn 0 to 1.0
Silicon (Si)Si 0.13 to 0.45
Carbon (C)C 0 to 0.25
Phosphorus (P)P 0 to 0.035
Sulfur (S)S 0 to 0.035

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM A204: Standard Specification for Pressure Vessel Plates, Alloy Steel, Molybdenum

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015